There are other reasons, neither few nor weak, for which the dignity and majesty of Scripture are not only affirmed in godly hearts, but brilliantly vindicated against the wiles of its disparagers; yet of themselves these are not strong enough to provide a firm faith, until our Heavenly Father, revealing his majesty there, lifts reverence for Scripture beyond the realm of controversy. Therefore Scripture will ultimately suffice for a saving knowledge of God only when its certainty is founded upon the inward persuasion of the Holy Spirit. Indeed, these human testimonies which exist to confirm it will not be vain if, as secondary aids to our feebleness, they follow that chief and highest testimony. But those who wish to prove to unbelievers that Scripture is the Word of God are acting foolishly, for only by faith can this be known. Augustine therefore justly warns that godliness and peace of mind ought to come first if a man is to understand anything of such great matters.
~John Calvin~
Institutes of the Christian Religion, Volumes 1 & 2, ed. John T. McNeill, trans. Ford Lewis Battles, The Library of Christian Classics (Louisville, KY: Westminster John Knox Press, 2011) Vol. 1.8.12. p. 92.
The Old Guys 
John Calvin – The Medicine Doesn’t Feed The Disease
16 AprWhat shall we say then? Are we to continue in sin that grace may abound? 2 By no means! How can we who died to sin still live in it? – Romans 6:1-2
Paul proceeds carefully to disprove the propounded slander. He, however, first rejects it by an indignant negative, in order to impress it on the minds of his readers, that nothing can be more inconsistent than that the grace of Christ, the repairer of our righteousness, should nourish our vices.
Who have died to sin, &c. An argument derived from what is of an opposite character. “He who sins certainly lives to sin; we have died to sin through the grace of Christ; then it is false, that what abolishes sin gives vigour to it.” The state of the case is really this,—that the faithful are never reconciled to God without the gift of regeneration; nay, we are for this end justified,—that we may afterwards serve God in holiness of life. Christ indeed does not cleanse us by his blood, nor render God propitious to us by his expiation, in any other way than by making us partakers of his Spirit, who renews us to a holy life. It would then be a most strange inversion of the work of God were sin to gather strength on account of the grace which is offered to us in Christ; for medicine is not a feeder of the disease, which it destroys.
~John Calvin~
Commentary on the Epistle of Paul the Apostle to the Romans (Bellingham, WA: Logos Bible Software, 2010), 218–219.
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